Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['5879', 'Z', '5675', 'i', 'O', 'T']

5879, 26, 5675, 9, 15, 20